Addin clash

I have written an COM Addin for Word and it works fine. It
is configured to load automatically and gets loaded
whenever word is launched. The Addin puts a custom menu
and a toolbar button.

I am now writing a COM Addin for Outlook. The problem
starts here. When Outlook uses Word as the email editor, I
dont want the Word COM Addin's Menu / Toolbar to appear.
Instead the Outlook COM Addin's Menu / Toolbar should
appear. Is there any means with which we can identify that
Word document is a email compose and not a normal word
document through the Word's WindowActivate event?

Thanks
Ashok